More footage and much clearer, showing someone both filling in ballots and stamping "received" on them with security overseeing the operation. It appears to be from the same location as above, in PA.
Footage of an election staff member in PA allegedly filling in blank voting ballots.
I've downloaded and attached the video in case it gets deleted. Please do this in the event that twitter or FB catch up and erase things!
Seems like the explanation going around twitter for this is that they're curing ballots, i.e. re-filling them in a format that the voting machine can process, which would explain why the man reads something aloud while the woman is filling it in with pauses. Not sure why they need to stamp it though.